- The definition of diabolic is something evil or of the devil.
An evil plot to take over the world is an example of a plot that would be described as diabolic.
- of the Devil or devils
- very wicked or cruel; fiendish
Origin of diabolicFrench diabolique ; from Ecclesiastical Late Latin diabolicus ; from diabolus: see devil
(comparative more diabolic, superlative most diabolic)
First attested between 1350 and 1400 from Middle English diabolik, from Middle French diabolique, from Late Latin diabolicus, from Ancient Greek διαβολικός (diavolikós, “devilish”), from διάβολος (diabolos, “devil”).